The first U.S. voters are making their voices heard Monday at the 2016 Iowa caucuses.
The process is not like a primary, where voters cast ballots for their presidential pick in a voting booth. Participation in the caucuses involves attending a public meeting. Republicans cast their votes in a secret ballot, while Democrats physically gather in different parts of a room dedicated to each candidate; the candidate's coalition needs to reach a certain threshold of voters in order for the candidate to get their votes.
See some of the best photos from the Iowa caucuses below:
Also on HuffPost: